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Long-Term Debt - Convertible Notes Interest Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Long-Term Debt      
Cash interest per contractual coupon rate $ 17,360 $ 19,451 $ 20,776
Convertible Senior Notes 1.00 percent due 2020 [Member]      
Long-Term Debt      
Cash interest per contractual coupon rate 2,875 2,875 2,875
Amortization of note discount 9,690 9,194 8,724
Amortization of debt issuance costs 624 559 518
Total interest expense related to Convertible Notes $ 13,189 $ 12,628 $ 12,117